Fatigue assessment of the welded joints containing process relevant imperfections

Javaheri, Ehsan; Hemmesi, Kimiya; Tempel, Peter; Farajian, Majid

doi:10.1007/s40194-018-00676-y

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Due to the increase of the gas pores, the cross-section is additionally enlarged for the samples of test series √area > 1000 µm to ensure comparable testing conditions. Further details on the specimen geometry, weld preparation, and process parameters are given in [28] for √area < 1000 µm, and in [29,30] for √area > 1000 µm. Figure 1.…”

Section: Materials and Test Seriesmentioning

confidence: 99%

“…An overview of the average hardness and residual stress values is provided in Table 3. Further details to the analyses are given in [28] and [29,30]. To evaluate the fatigue performance of the investigated weld samples, uniaxial fatigue tests at a frequency of 70 Hz and a load stress ratio of R = 0.1 utilizing a resonance test rig are performed.…”

Section: Hardness and Residual Stress Conditionmentioning

confidence: 99%

“…Based on these microscopic inspections, the fatigue test data points are separated in the two previously described test series, labeled as √ area < 1000 µm and √ area > 1000 µm, which act as comparison for the fatigue models later on. Further details regarding the fatigue tests are provided in [28] and [29,30], respectively. The statistical evaluation of the fatigue test data points reveals a scatter band in fatigue strength of a factor of 1.23 equaling the ratio of the nominal fatigue strength amplitude at P S = 10% to P S = 90%.…”

Section: Hardness and Residual Stress Conditionmentioning

confidence: 99%

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Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Leitner

Murakami

Farajian

et al. 2018

Metals

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This work investigates the effect of gas pores, as bulk imperfections, on the fatigue strength of welded mild steel joints. Two test series containing different butt joint geometries and weld process parameters are included in order to achieve two variable types of pore sizes. Based on the √ area-parameter by Murakami, the test series can be grouped into imperfections exhibiting √ area < 1000 µm and √ area > 1000 µm. Fatigue tests at a load stress ratio of R = 0.1 are performed, which act as comparison for the subsequent fatigue estimation. To assess the fatigue resistance, the approaches by Murakami, De Kazinczy, and Mitchell are utilized, which highlight certain differences in the applicability depending on the imperfection size. It is found that, on one hand, Murakami's approach is well suitable for both small and large gas pores depending on the applied model parameters. On the other hand, the fatigue concepts by De Kazinczy and Mitchell are preferably practicable for large defects with √ area > 1000 µm. In addition, the method by Mitchell incorporates the stress concentration factor of the imperfection, which can be numerically computed considering the size, shape, and location of the gas pore, as presented in this paper.

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Section: Materials and Test Seriesmentioning

confidence: 99%

Section: Hardness and Residual Stress Conditionmentioning

confidence: 99%

Section: Hardness and Residual Stress Conditionmentioning

confidence: 99%

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Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Leitner

Murakami

Farajian

et al. 2018

Metals

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“…However, due to the small size of cracks or low stress levels, the initiation stage is also considered [19,20]. Additionally, refinements or variants to the Paris law are applied to predict or analyze the fatigue life of welded joints [21,22]. Based in fracture mechanics, Murakami [23] proposed an expression for fatigue limit predictions of materials containing small defects or cracks as a function of the hardness and the size of small defects; Åman et al [24], in a recent work, modified the aforementioned expression in order to analyze the consequence of a small defect at the notch root.…”

Section: Introductionmentioning

confidence: 99%

Influence of Local Properties on Fatigue Crack Growth of Laser Butt Welds in Thin Plates of High-Strength Low-Alloy Steel

et al. 2021

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In this work, local properties such as hardness and fatigue crack grow rate in the heat-affected zone of four laser-welded butt joints in thin high-strength low-alloy steel were examined, so as to explain and predict fatigue lives at high stress levels through the fracture mechanics approach. The different welded series presented a similar fatigue crack growth rate in the heat-affected and fusion zones, but lower than base metal due to the higher hardness of the bainitic–martensitic microstructure verified in the welded series. The results showed that at high stress levels in the as-welded condition, the fatigue initiation stage can be neglected and assume some types of cracks, with an initial crack of 0.07 mm and appropriate fatigue crack growth rates, estimates of fatigue life close to the experimental results were obtained.

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Fatigue crack propagation of planar three-dimensional cracks

Livieri

Segàla

2022

International Journal of Fatigue

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Fatigue assessment of the welded joints containing process relevant imperfections

Cited by 9 publications

References 7 publications

Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Influence of Local Properties on Fatigue Crack Growth of Laser Butt Welds in Thin Plates of High-Strength Low-Alloy Steel

Fatigue crack propagation of planar three-dimensional cracks

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